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  1. Quantum Physics

    Photons reveal a weird effect called the quantum pigeonhole paradox

    Quantum particles seem to disobey a fundamental principle of mathematics.

    By Emily Conover
  2. Tech

    A new 2-D material uses light to quickly and safely purify water

    A newly designed material uses only light to speedily remove 99.9999 percent of microbes from water.

    By Jeremy Rehm
  3. Earth

    Greenland may have another massive crater hiding under its ice

    There may be yet another large crater buried beneath Greenland’s ice sheet. But it’s probably not related to the first one found last year.

    By Carolyn Gramling
  4. Tech

    Robots are becoming classroom tutors. But will they make the grade?

    Educational robots show promise for helping kids in the classroom or at home, but researchers are still figuring out how these bots should behave.